480
FXUS65 KBYZ 250639
AFDBYZ
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BILLINGS MT
1239 AM MDT SUN OCT 25 2026
KEY MESSAGES
- NEAR SEASONABLE TEMPERATURES (HIGHS IN THE 40S AND 50S) CONTINUE
INTO NEXT WEEK.
- CHANCE OF RAIN OR MIXED PRECIP IN EAST/SOUTHEAST MT LATE THIS
AFTERNOON INTO MONDAY.
- NEXT WEATHER SYSTEM BRINGS CHANCE OF RAIN/MTN SNOW TO AREA
MONDAY NIGHT THROUGH WEDNESDAY.
- UNSETTLED CONDITIONS CONTINUE THROUGH NEXT WEEK WITH HIGH LEVELS
OF UNCERTAINTY.
DISCUSSION
TODAY THROUGH SATURDAY...
HIGHS INTO NEXT WEEK WILL REMAIN GENERALLY IN THE 40S AND 50S.
LATE THIS AFTERNOON INTO MONDAY, AN UPPER LOW WILL CLIP SOUTHEAST
MONTANA, BRINGING A 30-80% CHANCE (HIGHEST NEAR THE DAKOTA BORDER)
OF PRECIPITATION EAST OF BILLINGS. ALONG THE DAKOTA BORDER,
THERE IS A 40% CHANCE OF MORE THAN 0.25". OVER THE REST OF THE
EAST, THERE IS GENERALLY A LESS THAN 50% CHANCE FOR MORE THAN
0.10". AS TEMPERATURES DROP OVERNIGHT, A LITTLE WET SNOW MAY
OCCUR, ALTHOUGH LITTLE TO NO ACCUMULATION IS EXPECTED. OUTSIDE OF
THE HIGHER HILLS, THERE IS A LESS THAN 20% CHANCE FOR MORE THAN A
TRACE OF SNOW. DURING THIS TIME, EASTERLY LOW LEVEL FLOW INCREASES
OVER THE PLAINS AND MAY RESULT IN AREAS OF FOG AND LOW CLOUDS
ACROSS THE WESTERN FOOTHILLS AND NEARBY PLAINS TONIGHT INTO MONDAY
MORNING.
A MORE IMPACTFUL SYSTEM APPROACHES FROM THE WEST MONDAY AFTERNOON
INTO WEDNESDAY AS AN UPPER TROUGH AGGRESSIVELY PUSHES INTO THE
NORTHERN ROCKIES. THE EXACT TRACK OF THE ASSOCIATED JET STREAK
WILL DECIDE WHERE THE BEST UPPER DYNAMICS HIT, BUT AT THIS TIME
A DECENT WIDESPREAD PRECIPITATION EVENT IS EXPECTED (40-70%
CHANCE OVER THE PLAINS, 60-90% OVER THE MOUNTAINS). CURRENTLY,
THERE IS A 20-40% CHANCE FOR AT LEAST 0.25" OF PRECIP OVER MUCH OF
THE PLAINS. OVER THE MOUNTAINS, SNOW IS FAVORED OVER SW-NW
ASPECTS OF THE BEARTOOTH/ABSAROKA AND CRAZY MOUNTAINS, WITH A
40-60% CHANCE FOR SEVERAL INCHES OF SNOW AND LOCALLY HIGHER
AMOUNTS OVER THE HIGHEST PEAKS. OVER THE NORTHERN BIGHORN
MOUNTAINS, GENERALLY 1 TO 2" OF SNOW ARE EXPECTED (70% CHANCE)
ABOVE 7000 FT, WITH LOCALLY HIGHER AMOUNTS OVER THE TALLEST PEAKS.
FOR THE END OF THE WORK WEEK INTO THE WEEKEND, THE PATTERN IS
EXPECTED TO REMAIN UNSETTLED UNDER SOUTHWEST FLOW, ALLOWING FOR
OCCASIONAL ROUNDS OF PRECIPITATION TO CONTINUE. ARCHER
AVIATION
VFR WILL PREVAIL OVER MOST OF THE REGION TODAY AND TONIGHT. A
WEATHER SYSTEM LIFTING UP THE HIGH PLAINS WILL SPREAD SOME LIGHT
PRECIP INTO FAR SOUTHEAST MT BY THIS EVENING, PRODUCING AREAS OF
MVFR CEILINGS (EAST OF KSHR AND SOUTH OF KMLS-KBHK) TONIGHT. THE
POTENTIAL FOR FOG WILL ALSO INCREASE LATE TONIGHT AND THIS WILL
NEED TO BE WATCHED. JKL
PRELIMINARY POINT TEMP/POPS
TDY MON TUE WED THU FRI SAT
-------------------------------------------------------
BIL 048 030/052 034/053 033/056 032/053 032/047 031/049
0/U 00/E 46/W 00/U 00/B 11/E 32/W
LVM 048 021/052 027/047 023/053 025/053 025/048 024/048
0/U 00/B 77/W 00/U 01/B 44/W 53/W
HDN 054 030/057 030/054 027/057 027/056 029/050 028/051
0/U 11/B 28/W 10/U 00/B 11/E 32/W
MLS 055 034/047 030/048 030/054 028/055 031/049 031/050
0/U 22/W 08/W 30/U 00/B 12/W 33/W
4BQ 052 033/046 030/052 030/056 031/061 034/053 034/052
1/B 52/W 06/W 20/U 00/B 01/B 23/W
BHK 052 027/043 023/048 026/053 025/057 029/051 029/050
0/U 54/N 23/W 30/U 00/U 12/W 33/W
SHR 052 026/056 027/052 025/057 026/060 028/055 028/052
0/U 10/B 13/W 00/U 00/B 01/B 32/W
BYZ WATCHES/WARNINGS/ADVISORIES
MT...NONE.
WY...NONE.
WEATHER.GOV/BILLINGS
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